Reenforced concrete structure



April 8 1924.

T. DAVENHALL I REENFORCED CONCRETE STRUCTURE Filed April 14 1.922 2 Sheets-Sheet I DAVENHALL REENFORCED CONCRETE STRUCTURE April 8 1924.

Filed April 14 1922 ,2 Sheets-Sheet 2 Fatented Apr. 8, i924."

; STATES THOMAS DAVENHALL, OF MOOSIG, PENNSYLVANIA;

REENFORGED CONCRETE STRUCTURE.

Application filed A rn 14, 1922. Serial no. 552,772.

T 0 all whom it may concern:

Be it known that I, THOMAS DAVENHALL, a citizen of the United States, residing at Moosic, in the county of Lackawanna and State of Pennsylvania, have invented certain new and useful Improvements in Reenforced Concrete Structures; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This inventionrelates to 'reenforced concrete columnar structures particularly adapted to posts or shores to be used in mines.

The object of the invention is to produce a post, shore or the like, sulfioientlylight to be easily handled, of strong and rigid construction, and having metallic caps on its ends providing protective surfaces to be engaged by wedges driven between an end of a post or prop and a ceiling, wall, floor or other structure engaged or shored thereby.

The invention consists in the reenforced and capped structure more specifically described hereinafter, illustrated in the drawings and defined in the appended claims.

I11 the drawings:

Figure 1 is a longitudinal section through one end of a post or prop, made in accordance with my invention;-

Figure l is an elevation of the end of.

a post opposite that shown in Figure 1 ;v

. Figure 2 is an elevation of a metallic cap member adapted to be embedded in the concrete at one end of the post and to cover". the extreme end of the post;

Figure 3 is a plan view of the cap;

Figure 4 is a section on the line H of Figure 1 looking in the direction of the arrows;

Figure 5 is a section on the line 55 of Figure 1 looking in the direction of the arrows;

Figure 6 is an elevation on a small scale of a post or prop made in accordance with this invention;

Figure 7 is a top plan view of a modified form of cap;

Figure 8 is an under plan view of the cap shown in Figure 7;

Figure 9 is a longitudinal section through the end of a post having the modified cap applied, taken on line 99 of Figure 7;

Figure 10 is a longitudinal secti n hrough the end of a post having the modified cap, on line 1010 of Figure 7;

Figure 11 is a cross section on line l1-11 of Figure 9;

Figure 12 is a cross section on line 1212 of Figure 10, and p v Figure 13 is a longitudinal section of a prop end illustrating a third form of cap.

Like reference characters indicate like parts throughout the several views.

The embodiment illustrated is a reenforced concrete columnar structure that is round in cross section and tapered slightly from the center toward each end. It will be understood, however, that the particular form of the structure'in cross section, its

degree of taper, or whether tapered at all, is a matter of design; and that the structure may be square or of other polygonal form in section or of any suitable cross section that will not interfere with the ready dling of the structure or diminish its strength.

In Figures 1 to 6, the article as a whole,

which I choose to call a post, is designatedby the letter P and tapers from the middle toward each end to a slight degree, the diameter being greater at the point 1 than elsewhere. The main body of the post comprises a mass of concrete 2 preferablybut not necessarily having an opening 3 from end to end therethrough imparting to the post lightness without materially diminishing its strength. The said opening 3 also has a function in the manufacture of the post in that it enables the concrete to set and dry more quickly.

At each end of the post is a metallic cap 4: comprising a hollow tubular body 5, an inner flange or transverse anchoring means comprising arms 6 and an outer flanged cap plate 7. The radiating anchoring arms 6 of the inner flange are provided with openings, notches or otherseats 8 in their ends for a purpose to be presently described. The cap plate 7 comprises aperipheral substantially cylindrical flange 9 extending backward toward arms 6; said flange 9 may have radial perforations 10 therein and is intended to be flush with the exterior surface of the concrete of the post when anchored thereto. It will be understood that a similar cap 4 is provided at each end of the post thus providing a flat, metallic surface on each end and a protection for the corners of the concrete by flange 9. The

tubular opening through each cap registers with the bore 3 extending from end to end of the post. There may be a plurality of openings 5 (preferably three) in the wall of the member 5, and a plurality of openings 7 in the cap plate 7 to lighten the cap and permit concrete to enter for the pur pose of more readily anchoring the cap, member to the post. Embedded within the concrete mass of the post is a plurality of angularly spaced rods or reinforcing bars 11, the ends of each bar fitting in notches or other seats 8 formed in the extremities of the arms 6 radiating from the lower or inner end of the tubular portion 5 of each cap. These reinforcing bars 11 are shown as of rectangular section but it will be obvious that they may be of any suitable section or may be irregular or twisted reinforcing bars of any suitable known type. Embracing the bars 11 at spaced intervals throughout the length of the post are bands 12. The inner surfaces of said bands 12 contact with the outer sides of the bars and confine them against springing outward, holding said bars in definite relation to each other while the concrete is being poured and strengthening the reinforcement. The reinforcing bars 11 may extend in parallel re lation from cap to cap, if desired, in order that rings of the same size may be used at intervals from end to end of the post to surround and stiffen the bars. In the con struction shown there are six radiating arms 6 on each cap plate and six reinforcing bars 11. It will be obvious that larger or smaller numbers of bars may be used according to choice and the strength desired to be imparted to the post.

In manufacturing this reenforced post, bars 11 of proper length will be provided, bands 12 properly spaced and secured at suitable distances apart encircling the bars, and the cap members 4 set up with the ends of the bars or rods seated in the notches 8' at the extremities of the radiating arms 6. After setting up the framework the concrete may be poured in the mold which is given a shape the counterpart of that desired for the post. The holes 5 laterally through the tubular part 5 of the cap permit the concrete to flow into them and thus assist in anchoring and steadying the caps on the post. The concrete will also press into the holes 7 and 10 of each cap and give further security to the cap as well as lightening the structure without unduly weakening it.

The modified cap P illustrated in Figures 7 to 12 inclusive is designed for large and strongly reenforced posts or columns. It is efdiis trueted substantially like the cap t except the? anchoring lugs or arms 6" project raiauyiawara from the edge of the flange 9" Land have eats 8 for the reception of retina flares totem "ea-s 11 Said lugs or arms 6 are spaced so as to extend midway between or to bisect the angles between arms 6. Thus, as shown, twice the number of reinforcing bars may be embedded in a post having this form of cap 1 as compared with the number that can be applied with the first described form of cap at. The bands 12 surround the bars 11 and 11, confining and reinforcing them. The bars 11 extend nearly to the ends of the post, midway between the bars 11 and alternating with them.

In Figure 13 is illustrated a cap i adapted for small or light posts. This form of cap comprises no central tubular extension but has the flange 9 and the radiating lugs or arms 6 provided with seats 8 for the reception of the ends of reinforcing bars 11". Bands 12 are used to encircle the reinforcing bars 11 the same as in the other forms.

The procedure to be followed in making posts is substantially the same with each form of cap. The particular cap selected depends upon the size of the post to be made and the strength required.

Inuse the posts or props may be erected bearing against opposed surfaces to be stayed. or braced and wedges driven between said surfaces and the metallic faces of the cap plates on the ends of the posts thus setting them firmly in place and wedging it rigidly in contact with the ceiling or walls designed to be supported by the posts. The construction is suificiently light and strong and may be conveniently handled in the uses for which it was designed.

Having described my invention what I claim and desire to secure by Letters Patent is:

1. A reenforced concrete post comprising a mass of concrete, a protecting cap anchored to one end thereof, said cap having anchoring means embedded in the concrete and provided with seats, and a plurality of embedded reinforcing bars the ends of which engage said seats.

2. A reenforced concrete post comprising a mass of concrete having a cap anchored thereto at one end providing an outer protective cap plate, said cap having anchoring means embedded in the concrete and provided with seats, a plurality of reinforcing bars the ends of which engage said seats, and a plurality of bands surrounding said bars, said bars and bands being embedded in the concrete.

3. A reenforced concrete post comprising a concrete body having a longitudinal opening therein, a cap anchored to said concrete at one end and having an opening therethrough registering with the opening in the post, said cap providing a protective cap plate on the extremity of the post and having anchoring means embedded in the concrete and provided with seats, reinforcing bars the ends of which engage said seats, and bands embracing said bars at spaced intervals, the bars and bands being embedded in the concrete.

4. A reenforced concrete post comprising a concrete mass having an opening longitudinally therethrough; a metallic cap, having openings registering with the opening in the concrete mass, and including protective cap plates, and anchoring means provided with seats embedded in the concrete; a plurality of reinforcing bars the ends of which engage said seats in the anchoring means, and reinforcing bands embedded in the concrete embracing said bars.

5. A cap for reenforced concrete posts, said cap comprising a cap plate and anchoring means of less diameter than the cap plate extending transverse of the axis of the cap, said anchoring means having seats for reinforcing bars.

6. A cap for reenforced concrete posts, said cap comprising a cap plate having a peripheral substantially cylindrical flange and radiating anchoring means adapted to be buried in the concrete, said anchoring means having seats for the reception of reinforcing bars.

7. A cap for reenforced concrete posts, said cap comprising a cap plate having a peripheral substantially cylindrical flange, anchoring means projecting radially inward from said flange and provided with seats for reinforcing bars.

8. A cap for reenforced concrete posts, said cap comprising a cap plate having a peripheral substantially cylindrical flange,

anchoring means projecting radially inward.

from said flange and provided with seats for reinforcing bars, and a central member having anchoring means extendingv radially outward therefrom, said last named anchoring means being provided with seats for reinforcing bars.

9. A cap for reenforced concrete posts comprising a tubular part having on one end a cap plate with a peripheral cylindrical flange and on the other end radially extending anchoring arms of less radius than the cap said arms provided with outwardly directed seats adapted to receive reinforcement bars. 7 v e 10. Acap for reenforced concrete posts comprising a tubular part having on one end a cap plate with a peripheral cylindrical flange and anchoring arms extending radially inwardly from said peripheral flange and outwardly from the other end of the tubular member, said inwardly and outwardly extending arms arranged angularly so as to alternate successively and provided on their free ends with seats adapted to receive reinforcement bars, substantially as specified.

In testimony whereof I affix my signature.

THOMAS DAVENHALL. V 

